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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
111 lines
3.1 KiB
ArmAsm
111 lines
3.1 KiB
ArmAsm
/* Optimized version of the standard strchr() function.
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This file is part of the GNU C Library.
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Copyright (C) 2000-2021 Free Software Foundation, Inc.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* Return: the address of the first occurence of chr in str or NULL
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Inputs:
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in0: str
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in1: chr
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A modified version of memchr.S, the search ends when the character is
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found or the terminating null character is encountered.
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This implementation assumes little endian mode. For big endian mode,
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the instruction czx1.r should be replaced by czx1.l. */
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#include <sysdep.h>
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#undef ret
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#define saved_lc r18
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#define poschr r19
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#define pos0 r20
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#define val1 r21
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#define val2 r22
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#define tmp r24
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#define chrx8 r25
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#define loopcnt r30
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#define str in0
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#define chr in1
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ENTRY(strchr)
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.prologue
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alloc r2 = ar.pfs, 2, 0, 0, 0
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.save ar.lc, saved_lc
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mov saved_lc = ar.lc // save the loop counter
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.body
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mov ret0 = str
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and tmp = 7, str // tmp = str % 8
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mux1 chrx8 = chr, @brcst
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extr.u chr = chr, 0, 8 // retain only the last byte
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cmp.ne p8, p0 = r0, r0 // clear p8
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;;
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sub loopcnt = 8, tmp // loopcnt = 8 - tmp
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cmp.eq p6, p0 = tmp, r0
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(p6) br.cond.sptk .str_aligned;;
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adds loopcnt = -1, loopcnt;;
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mov ar.lc = loopcnt
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.l1:
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ld1 val2 = [ret0], 1
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;;
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cmp.eq p6, p0 = val2, chr
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cmp.eq p7, p0 = val2, r0
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(p6) br.cond.spnt .restore_and_exit
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(p7) br.cond.spnt .notfound
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br.cloop.sptk .l1
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.str_aligned:
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ld8 val1 = [ret0], 8;;
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nop.b 0
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nop.b 0
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.l2:
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ld8.s val2 = [ret0], 8 // don't bomb out here
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czx1.r pos0 = val1
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xor tmp = val1, chrx8 // if val1 contains chr, tmp will
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;; // contain a zero in its position
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czx1.r poschr = tmp
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cmp.ne p6, p0 = 8, pos0
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;;
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cmp.ne p7, p0 = 8, poschr
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(p7) br.cond.spnt .foundit
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(p6) br.cond.spnt .notfound
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chk.s val2, .recovery
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.back:
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mov val1 = val2
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br.cond.dptk .l2
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.foundit:
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(p6) cmp.lt p8, p0 = pos0, poschr // we found chr and null in the word
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(p8) br.cond.spnt .notfound // null was found before chr
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add ret0 = ret0, poschr ;;
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adds ret0 = -15, ret0 ;; // should be -16, but we decrement
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.restore_and_exit: // ret0 in the next instruction
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adds ret0 = -1, ret0 // ret0 was pointing 1 char too far
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mov ar.lc = saved_lc // restore the loop counter
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br.ret.sptk.many b0
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.notfound:
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mov ret0 = r0 // return NULL if null was found
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mov ar.lc = saved_lc
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br.ret.sptk.many b0
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.recovery:
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adds ret0 = -8, ret0;;
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ld8 val2 = [ret0], 8 // bomb out here
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br.cond.sptk .back
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END(strchr)
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weak_alias (strchr, index)
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libc_hidden_builtin_def (strchr)
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